import Vue from 'vue'
import VueRouter from 'vue-router'

const Login = () =>
  import ('../components/Login.vue');

const Home = () =>
  import ('../components/Home.vue');
const Welcome = () =>
  import ('../components/Welcome.vue');
const Users = () =>
  import ('../components/user/Users.vue');
const Rights = () =>
  import ('../components/power/Rights.vue');

const Roles = () =>
  import ('../components/power/Roles.vue');
const Cate = () =>
  import ('../components/goods/Cate.vue');

const Params = () =>
  import ('../components/goods/Params.vue');

const GoodsList = () =>
  import ('../components/goods/List.vue');

const Add = () =>
  import ('../components/goods/Add.vue');

const Order = () =>
  import ('../components/orders/Order.vue');

const Report = () =>
  import ('../components/report/Report.vue')

Vue.use(VueRouter)

const routes = [{
    path: '',
    redirect: '/login'
  },
  {
    path: '/login',
    component: Login
  },
  {
    path: '/home',
    component: Home,
    redirect: '/welcome',
    children: [{
        path: '/welcome',
        component: Welcome
      },
      {
        path: '/users',
        component: Users
      },
      {
        path: '/rights',
        component: Rights
      },
      {
        path: '/roles',
        component: Roles
      },
      {
        path: '/categories',
        component: Cate
      },
      {
        path: '/params',
        component: Params
      },
      {
        path: '/goods',
        component: GoodsList
      },
      {
        path: '/goods/add',
        component: Add
      },
      {
        path: '/orders',
        component: Order
      },
      {
        path: '/reports',
        component: Report
      }
    ]
  }
]

const router = new VueRouter({
  mode: 'history',
  routes
})

// 路由导航守卫控制访问权限 beforeEach 
router.beforeEach((to, from, next) => {
  // to 将要访问的路径
  // from 代表从哪个路径跳转而来
  // next 是一个函数，表示放行
  // console.log(to);
  // console.log(from);
  // 如果用户访问的是登录页面，则直接放行
  if (to.path == "/login") return next();
  // 如果不是登录页面，则从sessionStorage中获取到保存的token值
  const tokenStr = window.sessionStorage.getItem("token");
  // 如果token值不存在，则强制跳转回登录页面
  if (!tokenStr) return next("/login");
  // 如果token值存在，则放行
  next();
})
export default router